Brucite is the mineral form of magnesium hydroxide, with the chemical formula Mg(OH)2. It is pearly white or pale green in colour, translucent, with perfect cleavage, and tabular crystals or massive. It has a hardness of 2.5. Brucite is often found in hydothermal veins in serpentine. Most notable locations include Wood's Chrome Mine, Cedar Hill Quarry, Lancaster County, Pennsylvania.
Franklin brucite occurs as acicular to stout prismatic 1-2 mm crystals with a tapering trigonal pyramidal habit and triangular cross-section.
Brucite is a magnesium hydroxide mineral and the Mg-analogue of pyrochroite.
Brucite was first reported from Franklin in a narrow veinlet cutting franklinite-willemite ore. At Sterling Hill, brucite has been found as 1.0 cm platy crystals, intimately mixed with fine-grained orange zincite and associated with calcite, dypingite, and sussexite in the north orebody.
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